Drem !
So, I've noticed something. I have not played Morrowind yet but I've seen some screenshots and something get my intention : the resemblance between the Ascended Sleeper and the Seekers. It seems obvious that the Seekers from Dragonborn are based on a mix between the Sleeper and the creatures from the Cthulhu Mythos :
http://i39.servimg.com/u/f39/16/69/79/34/seeker11.jpg
But the most intriguing was the resemblance between Miraak's mask and Dagoth Ur's one. I've noticed those details (in red on the second line):
http://i39.servimg.com/u/f39/16/69/79/34/dagoth11.jpg
Another resemblance is about Miraak's robes and Sleeper's robes :
http://i39.servimg.com/u/f39/16/69/79/34/miraak10.jpg
So, Dagoth Ur was in control on the Sleeper and the Dagoths. And Miraak was in control on the Seekers and the other Hermaeus creatures. We know that dragon priest's masks have a great power, but the Miraak's one is different from the others ; and it looks like the Dagoth's one.
Many items from Morrowind are also in Skyrim, but with another look.
That's why I ask the question : do you think the Miraak's mask may be the Dagoth's mask, or a "brother" of it ?
(I hope I'm clear in my deduction, with my made-in-france-english :'3 )